Automobile exhaust collection detector for automobile exhaust detection

Abstract

The invention discloses an automobile exhaust gas collection detector for automobile exhaust gas detection, and belongs to the field of exhaust gas collection and detection.The automobile exhaust gas collection detector comprises a gas collection box, a rectangular through groove is formed in the surface of the upper end of the gas collection box, an exhaust gas detector is installed on the inner wall of the rectangular through groove, and an air inlet hole is formed in the surface of one end of the gas collection box; a butt joint pipe is inserted into the inner wall of the gas inlet hole, and a blocking mechanism is connected to the surface of the end of the gas collecting box and used for blocking the gas inlet hole after the butt joint pipe is detached; a sealing structure is connected between the gas collecting box and the butt-joint pipe and is used for connecting and sealing the butt-joint pipe with the gas collecting box after the butt-joint pipe is inserted; by arranging the first strip-shaped placement groove, the vertical fixing rod, the first spring, the sliding sleeve block and the plugging plate, when the butt joint pipe is detached, the elastic force of the first spring can rapidly push the sliding sleeve block to move, then the plugging plate is driven to rapidly reset, and the air inlet hole is tightly plugged.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas collection and detection technology, and more particularly to an exhaust gas collection and detection instrument for automobile exhaust gas detection. Background Technology

[0002] In the current field of automotive exhaust emission testing, accurate detection of vehicle exhaust components is crucial for assessing vehicle emissions and controlling environmental pollution. However, existing automotive exhaust collection and testing instruments commonly suffer from exhaust leakage during the disconnection process.

[0003] Traditional testing equipment lacks an effective air intake sealing mechanism in its structural design. When the connecting pipe needs to be detached from the gas collection box after exhaust gas collection is completed, the air intake of the gas collection box is in an open state, and the residual exhaust gas inside the box will leak into the surrounding environment without hindrance. Automobile exhaust contains a variety of harmful substances such as carbon monoxide, nitrogen oxides, hydrocarbons, and particulate matter, which are seriously harmful to human health and the environment. For example, carbon monoxide has a binding capacity with hemoglobin 200-300 times stronger than oxygen. Inhaling large amounts can lead to hypoxia, causing symptoms such as headaches, dizziness, and nausea, and in severe cases, it can even be life-threatening. Nitrogen oxides can form acid rain and photochemical smog, damaging the ecological environment and affecting crop growth. In places such as vehicle inspection stations, where a large number of vehicles need to be inspected every day, the frequent disconnection and reconnection of the connecting pipe makes the exhaust gas leakage problem more prominent, which not only poses a potential threat to the health of operators, but also pollutes the air at the inspection site and affects the quality of the surrounding environment.

[0004] In the process of vehicle exhaust emission testing, the efficiency of disassembling and assembling the exhaust emission detector directly affects the progress of the entire testing work. Currently, most exhaust emission detectors on the market have complex disassembly and assembly structures, making operation cumbersome. Some detectors require the use of various specialized tools and the assembly and fixing of multiple components in a specific order during installation. This not only demands a high level of technical skill from the operators but also consumes a significant amount of time and effort. Disassembling the exhaust emission detector presents similar challenges, requiring the components to be disassembled step-by-step in reverse order. Slight carelessness can lead to component damage or insecure installation, affecting subsequent testing work. In vehicle inspection stations and other locations requiring efficient testing of large numbers of vehicles, this complex disassembly and assembly process severely reduces testing efficiency, increases vehicle waiting time, and lowers the service quality and operational efficiency of the inspection station. For example, during peak hours, inspection stations may experience vehicle backlogs due to slow disassembly and assembly of exhaust emission detectors, disrupting the normal testing order.

[0005] Finally, during the testing process, as more vehicle exhaust gases enter the gas collection chamber, the amount of exhaust gas inside gradually increases. If too much exhaust gas is collected, it may lead to excessive pressure within the chamber, affecting the normal flow and distribution of the exhaust gases and thus interfering with the results of the exhaust gas analyzer. Furthermore, excessive exhaust gas can damage the analyzer and shorten its lifespan. However, existing testing equipment cannot monitor the amount of exhaust gas collected in the chamber in real time; operators can only estimate whether the collection is saturated based on experience, which often leads to inaccurate judgments. If the exhaust gas collection is saturated but the operator fails to notice in time, continuing testing will yield inaccurate results that do not accurately reflect the vehicle's emissions. This not only affects the accurate assessment of vehicle emissions but may also allow vehicles that do not meet emission standards to pass testing, negatively impacting environmental protection. Summary of the Invention

[0006] The purpose of this invention is to solve the problems in the prior art by proposing an automotive exhaust gas collection and detection instrument for automotive exhaust gas detection.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An exhaust gas collection and testing instrument for automobile exhaust gas detection includes a gas collection box. A rectangular through groove is formed on the upper surface of the gas collection box. An exhaust gas detector is installed on the inner wall of the rectangular through groove. An air inlet is formed on one end surface of the gas collection box. A connecting pipe is inserted into the inner wall of the air inlet. A sealing mechanism is connected to the end surface of the gas collection box for sealing the air inlet after the connecting pipe is removed. A sealing structure is provided between the gas collection box and the connecting pipe to seal the connection between the connecting pipe and the gas collection box after the connecting pipe is inserted. A piston plate is connected to the piston on the inner wall of the gas collection box, and a spring is fixedly connected between the inner end wall of the gas collection box and the piston plate. A disassembly assembly is connected between the gas collection box and the exhaust gas detector for quick disassembly and assembly of the exhaust gas detector. The gas collection box has an ejection structure installed on its inner bottom wall, which is located directly below the opening of the rectangular through slot.

[0008] Preferably, the disassembly and assembly assembly includes a strip-shaped mounting groove two horizontally opened in the bottom wall of the gas collection box and a limiting slot opened in the periphery of the exhaust gas detector. A horizontal fixing rod is fixedly connected between the two end walls of the strip-shaped mounting groove two. A spring three is sleeved around the periphery of the horizontal fixing rod. A movable sleeve block is slidably sleeved around the periphery of the horizontal fixing rod, and the movable sleeve block is slidably connected to the inner wall of the strip-shaped mounting groove two. A limiting insert is fixedly connected to the lower end surface of the movable sleeve block. A linkage component is connected between the limiting insert block and the piston plate.

[0009] Preferably, the sealing mechanism includes a vertically formed strip-shaped placement groove on the end surface of the gas collection box. A reinforcing rod is fixedly connected between the two end walls of the strip-shaped placement groove. A spring is sleeved around the reinforcing rod. A sliding sleeve block is slidably sleeved around the reinforcing rod. The sliding sleeve block is slidably connected to the inner wall of the strip-shaped placement groove. A sealing plate is fixedly connected to the surface of the sliding sleeve block. The sealing plate contacts and slides with the gas collection box.

[0010] Preferably, the ejection structure includes a telescopic rod fixedly connected to the top wall of the gas collection box, a bearing plate fixedly connected to the lower end of the telescopic rod, and a spring sleeved around the periphery of the telescopic rod.

[0011] Preferably, the linkage component includes a sleeve block fixedly connected to the top wall of the gas collection box, a connecting rod fixedly connected to the surface of the piston plate, the sleeve block slidably sleeved around the connecting rod, one end of the connecting rod being fixedly connected to one end of the limiting plug, and one end of the limiting plug being provided with an arc-shaped slope.

[0012] Preferably, the sealing structure includes a mating ring fixedly connected to the periphery of the connecting pipe and a sealing slot formed on the end surface of the gas collection box, and the sealing slot is designed to be located at the periphery of the air inlet. The mating ring is fixedly connected to a sealing insert ring on the surface of the end of the gas collection box.

[0013] Preferably, one end of the spring is fixedly connected to the end wall of the strip-shaped mounting groove, and the other end of the spring is fixedly connected to one end surface of the sliding sleeve block.

[0014] Preferably, the upper end of the fourth spring is fixedly connected to the inner top wall of the gas collection box, and the lower end of the fourth spring is fixedly connected to the upper surface of the support plate.

[0015] Preferably, one end of the limiting plug is inserted into the inner wall of the limiting slot, and the opening size of the limiting slot is adapted to the design size of the limiting plug.

[0016] Preferably, the sealing ring is inserted into the inner wall of the sealing slot, and the opening size of the sealing slot is compatible with the design size of the sealing ring.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting up a strip-shaped mounting groove, a vertical support rod, a spring, a sliding sleeve block, and a sealing plate, when the connecting pipe is disassembled, the elastic force of the spring will quickly push the sliding sleeve block to move, thereby causing the sealing plate to quickly reset and tightly seal the air inlet. This sealing mechanism can automatically seal the air inlet the moment the connecting pipe is disassembled, effectively preventing exhaust gas leakage, providing a safe and reliable environment for testing work, and protecting the health of operators and the environmental quality of the testing site.

[0018] 2. The combined design of the strip-shaped mounting slot II, horizontal fixing rod, spring III, moving sleeve block, limit plug, and limit slot makes the assembly and disassembly of the exhaust gas detector extremely simple and quick. During installation, utilizing the special design of the curved slope, the operator only needs to apply downward pressure to the exhaust gas detector. The limit plug will automatically move under the action of the curved slope. Once the exhaust gas detector is in place, the limit plug, under the action of spring III, inserts into the limit slot, achieving a secure fixation of the exhaust gas detector.

[0019] 3. The design of the piston plate, spring two, sleeve block, and connecting rod allows the gas collection box to automatically trigger the disengagement of the exhaust gas detector based on the amount of exhaust gas collected inside. When too much exhaust gas is collected in the gas collection box, the exhaust gas pressure pushes the piston plate to move. The piston plate then moves the connecting rod and the limit block, causing the limit block to no longer insert into the limit slot, thus achieving automatic disengagement of the exhaust gas detector. Simultaneously, the coordinated action of the telescopic rod, the support plate, and spring four ensures that the spring force pushes the support plate upwards the instant the limit block no longer inserts into the limit slot, causing the exhaust gas detector to move upwards under an upward thrust. Operators can quickly determine if the exhaust gas collection is saturated by observing the upward movement of the exhaust gas detector, allowing for timely intervention. This automatic detection and alert function prevents excessive exhaust gas collection from affecting the accuracy of the exhaust gas detector, ensuring that each test is conducted under appropriate conditions and improving the reliability and accuracy of vehicle exhaust gas test results. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the automobile exhaust collection and detection instrument for automobile exhaust gas detection proposed in this invention. Figure 2 This is a structurally disassembled schematic diagram of the connecting pipe and gas collection box in the automobile exhaust gas collection and testing instrument for automobile exhaust gas detection proposed in this invention. Figure 3 This is a front sectional view of the automotive exhaust gas collection and detection instrument for automotive exhaust gas detection proposed in this invention. Figure 4 This is a three-dimensional cross-sectional view of the exhaust gas detector after it has been disassembled in the automobile exhaust gas collection and detector for automobile exhaust gas detection proposed in this invention. Figure 5This is a schematic diagram of the exhaust gas detector in the automobile exhaust gas collection and detection instrument for automobile exhaust gas detection proposed in this invention. Figure 6 This is a schematic diagram of the connection structure between the connecting pipe and the docking ring in the automobile exhaust gas collection and testing instrument for automobile exhaust gas detection proposed in this invention. Figure 7 This invention relates to an automotive exhaust gas collection and testing instrument for detecting vehicle exhaust emissions. Figure 2 Enlarged view of the structure at point A in the middle; Figure 8 This invention relates to an automotive exhaust gas collection and testing instrument for detecting vehicle exhaust emissions. Figure 4 Enlarged view of the structure at point B.

[0021] In the diagram: 1. Gas collection box; 2. Rectangular channel; 3. Exhaust gas detector; 4. Air inlet; 5. Connecting pipe; 6. Strip-shaped mounting slot one; 7. Vertical support rod; 8. Spring one; 9. Sliding sleeve block; 10. Sealing plate; 11. Connecting ring; 12. Sealing slot; 13. Sealing insert ring; 14. Piston plate; 15. Spring two; 16. Strip-shaped mounting slot two; 17. Horizontal support rod; 18. Spring three; 19. Moving sleeve block; 20. Limiting insert block; 21. Limiting slot; 22. Arc-shaped slope; 23. Telescopic rod; 24. Bearing plate; 25. Spring four; 26. Sleeve block; 27. Connecting rod. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Example, refer to Figure 1-8This is an automotive exhaust gas collection and testing instrument for detecting vehicle exhaust gases. It includes a gas collection box 1, which is rectangular in shape and made of stainless steel to ensure its strength and corrosion resistance. A rectangular groove 2 is formed on the upper surface of the gas collection box 1. The dimensions of the rectangular groove 2 are designed according to the size of the exhaust gas detector 3 to ensure accurate placement of the detector 3. The exhaust gas detector 3 is installed on the inner wall of the rectangular groove 2 and is fixed within the groove 2 with bolts. It is used to detect various components in automotive exhaust gases. An air inlet 4 is formed on one end surface of the gas collection box 1. The air inlet 4 is circular, and its diameter is designed according to the size of the vehicle's exhaust pipe and the exhaust gas flow rate. A connecting pipe 5 is inserted into the inner wall of the air inlet 4. The connecting pipe 5 is made of rubber and has a certain degree of flexibility for easy connection to the vehicle's exhaust pipe. A sealing mechanism is connected to the end surface of the gas collection box 1. When the connecting pipe 5 is removed, the sealing mechanism can seal the air inlet 4 to prevent outside air from entering the gas collection box 1 and affecting the test results. A sealing structure connects the gas collection box 1 and the connecting pipe 5. When the connecting pipe 5 is inserted, the sealing structure ensures a tight seal between the connecting pipe 5 and the gas collection box 1, preventing exhaust gas leakage. A piston plate 14, made of rubber, is connected to the inner wall of the gas collection box 1 and fits tightly against the inner wall, allowing it to slide along the inner wall. A spring 15, a compression spring, is fixedly connected between the inner wall of the gas collection box 1 and the piston plate 14. In its natural state, the spring allows the piston plate 14 to be positioned close to the air inlet 4. A disassembly assembly connects the gas collection box 1 and the exhaust gas detector 3, enabling quick disassembly and assembly of the exhaust gas detector 3 for easy maintenance and replacement. The gas collection box 1 has an ejector structure installed on its inner bottom wall, and the ejector structure is located directly below the opening of the rectangular through slot 2. When it is necessary to remove the exhaust gas detector 3, the ejector structure can eject the exhaust gas detector 3 out of the rectangular through slot 2 for easy operation. The connecting pipe 5 and the gas collection box 1 can be fixed with a suitable adhesive.

[0024] Furthermore, the assembly / disassembly component includes a transversely formed strip-shaped mounting groove 16 on the bottom wall of the gas collection box 1. The length and width of the strip-shaped mounting groove 16 are designed according to the dimensions of the movable sleeve 19 and the horizontal fixing rod 17. The horizontal fixing rod 17 is fixedly connected between the two end walls of the strip-shaped mounting groove 16. The horizontal fixing rod 17 is made of stainless steel and has high strength. A spring 18 is sleeved around the horizontal fixing rod 17. The spring 18 is a tension spring, which allows the movable sleeve 19 to be positioned at one end of the strip-shaped mounting groove 16 in its natural state. The movable sleeve 19 is slidably sleeved around the horizontal fixing rod 17, and the movable sleeve 19 is slidably connected to the inner wall of the strip-shaped mounting groove 16. The movable sleeve 19 can slide along the horizontal fixing rod 17 within the strip-shaped mounting groove 16. A limiting insert 20 is fixedly connected to the lower surface of the movable sleeve 19. The limiting insert 20 is rectangular in shape, and its size is adapted to the limiting slot 21. The exhaust gas detector 3 has a limiting slot 21 on its periphery. When the exhaust gas detector 3 is installed in the rectangular through slot 2, the limiting insert 20 can be inserted into the limiting slot 21 to limit and fix the exhaust gas detector 3. A linkage component is connected between the limiting insert 20 and the piston plate 14. When the piston plate 14 moves, the limiting insert 20 can be moved through the linkage component, thereby realizing the disassembly and assembly of the exhaust gas detector 3. Through this disassembly and assembly component, when the piston plate 14 moves, the limiting insert 20 can be inserted into or pulled out of the limiting slot 21 to realize the quick disassembly and assembly of the exhaust gas detector 3, which facilitates the maintenance and replacement of the exhaust gas detector 3.

[0025] Furthermore, the sealing mechanism includes a vertically formed strip-shaped mounting groove 6 on the end surface of the gas collection box 1. The length and width of the strip-shaped mounting groove 6 are designed according to the dimensions of the sliding sleeve block 9 and the upright rod 7. The upright rod 7 is fixedly connected between the two end walls of the strip-shaped mounting groove 6. The upright rod 7 is made of stainless steel and has high strength. A spring 8 is sleeved around the upright rod 7. The spring 8 is a compression spring, which allows the sliding sleeve block 9 to be positioned at the upper end of the strip-shaped mounting groove 6 in its natural state. The sliding sleeve block 9 is slidably sleeved around the upright rod 7 and is slidably connected to the inner wall of the strip-shaped mounting groove 6. The sliding sleeve block 9 can slide along the upright rod 7 within the strip-shaped mounting groove 6. A sealing plate 10 is fixedly connected to the surface of the sliding sleeve 9. The sealing plate 10 is circular, and its diameter is larger than that of the air inlet 4. The sealing plate 10 contacts and slides with the gas collection box 1. When the connecting pipe 5 is removed, the spring 8 pushes the sliding sleeve 9 to move downward, which in turn moves the sealing plate 10 downward, thereby sealing the air inlet 4. When the connecting pipe 5 is removed, the sealing plate 10 automatically seals the air inlet 4 under the action of the spring 8 to prevent outside air from entering the gas collection box 1 and affecting the test results.

[0026] Furthermore, the ejection structure includes a telescopic rod 23 fixedly connected to the top wall of the gas collection box 1. The telescopic rod 23 is a hydraulic telescopic rod, which has good stability and telescopic performance. A support plate 24 is fixedly connected to the lower end of the telescopic rod 23. The support plate 24 is rectangular, and its size is adapted to the size of the rectangular through slot 2 to support the exhaust gas detector 3. A spring 25 is sleeved around the telescopic rod 23. The spring 25 is a compression spring, which allows the support plate 24 to be positioned close to the rectangular through slot 2 in its natural state. When it is necessary to remove the exhaust gas detector 3, the telescopic rod 23 extends, pushing the support plate 24 upward and ejecting the exhaust gas detector 3 from the rectangular through slot 2, making it convenient for the operator to remove the exhaust gas detector 3.

[0027] Furthermore, the linkage component includes a sleeve block 26 fixedly connected to the top wall of the gas collection box 1. The sleeve block 26 is cylindrical with a through hole in the middle for connecting the connecting rod 27. The connecting rod 27 is fixedly connected to the surface of the piston plate 14. The connecting rod 27 is cylindrical and its diameter is smaller than the diameter of the through hole in the sleeve block 26, allowing the connecting rod 27 to slide within the sleeve block 26. The sleeve block 26 is slidably sleeved on the periphery of the connecting rod 27. One end of the connecting rod 27 is fixedly connected to one end of the limiting insert 20. When the piston plate 14 moves, it drives the connecting rod 27 to move, thereby driving the limiting insert 20 to move. One end of the limiting insert 20 is provided with an arc-shaped slope 22. The design of the arc-shaped slope 22 makes it easier for the limiting insert 20 to be inserted into the limiting slot 21. When the piston plate 14 moves, the connecting rod 27 drives the limiting insert 20 to move, realizing the disassembly and assembly of the exhaust gas detector 3. The design of the arc-shaped slope 22 improves the smoothness of the insertion of the limiting insert 20 into the limiting slot 21.

[0028] Furthermore, the sealing structure includes a mating ring 11 fixedly connected to the periphery of the connecting pipe 5. The mating ring 11 is annular, made of rubber, and has a certain degree of flexibility. A sealing slot 12 is provided on the end surface of the gas collection box 1, and the sealing slot 12 is designed to be located on the periphery of the air inlet 4. The size of the sealing slot 12 is adapted to the sealing insert ring 13. The sealing insert ring 13 is fixedly connected to the end surface of the mating ring 11 relative to the gas collection box 1. The sealing insert ring 13 is annular, made of rubber, and has good sealing performance. When the connecting pipe 5 is inserted into the air inlet 4, the sealing insert ring 13 is inserted into the sealing slot 12, thereby sealing the connection between the connecting pipe 5 and the gas collection box 1. By inserting the sealing insert ring 13 into the sealing slot 12, leakage of exhaust gas at the connection between the connecting pipe 5 and the gas collection box 1 is effectively prevented, ensuring the accuracy of the test results.

[0029] Furthermore, one end of the spring-8 is fixedly connected to the end wall of the strip-shaped mounting groove-6 by welding to ensure a firm connection. The other end of the spring-8 is fixedly connected to one end surface of the sliding sleeve block 9 by welding as well. This fixing method allows the spring-8 to function stably. After the connecting pipe 5 is removed, it reliably pushes the sliding sleeve block 9 to move, thereby causing the sealing plate 10 to seal the air inlet 4.

[0030] Furthermore, the upper end of spring 4 25 is fixedly connected to the inner top wall of the gas collection box 1 by welding to ensure a firm connection. The lower end of spring 4 25 is fixedly connected to the upper surface of the support plate 24 by welding. This fixing method allows spring 4 25 to function stably, keeping the support plate 24 close to the rectangular through slot 2 in its natural state. When the exhaust gas detector 3 needs to be removed, the support plate 24 is reliably pushed upward to eject the exhaust gas detector 3 from the rectangular through slot 2.

[0031] Furthermore, one end of the limiting plug 20 is inserted into the inner wall of the limiting slot 21, and the opening size of the limiting slot 21 is adapted to the design size of the limiting plug 20. The gap between the limiting plug 20 and the limiting slot 21 is small to ensure that the limiting plug 20 can be firmly inserted into the limiting slot 21. By inserting the limiting plug 20 into the limiting slot 21, the exhaust gas detector 3 is limited and fixed, preventing the exhaust gas detector 3 from moving during the detection process and ensuring the stability of the detection.

[0032] Furthermore, the sealing ring 13 is inserted into the inner wall of the sealing slot 12, and the opening size of the sealing slot 12 is compatible with the design size of the sealing ring 13. The sealing ring 13 and the sealing slot 12 fit tightly with minimal gap to ensure a good sealing effect. By inserting the sealing ring 13 into the sealing slot 12, leakage of exhaust gas at the connection between the connecting pipe 5 and the gas collection box 1 is effectively prevented, ensuring the accuracy of the test results.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An exhaust gas collection and testing instrument for automobile exhaust gas detection, comprising a gas collection box (1), wherein a rectangular through groove (2) is formed on the upper surface of the gas collection box (1), and an exhaust gas detector (3) is installed on the inner wall of the rectangular through groove (2), characterized in that, The gas collection box (1) has an air inlet (4) on one end surface. A connecting pipe (5) is inserted into the inner wall of the air inlet (4). A sealing mechanism is connected to the end surface of the gas collection box (1) for sealing the air inlet (4) after the connecting pipe (5) is removed. A sealing structure is provided between the gas collection box (1) and the connecting pipe (5) for sealing the connection between the connecting pipe (5) and the gas collection box (1) after the pipe is inserted. A piston plate (14) is connected to the inner wall of the gas collection box (1), and a spring (15) is fixedly connected between the inner end wall of the gas collection box (1) and the piston plate (14). A disassembly assembly is connected between the gas collection box (1) and the exhaust gas detector (3) for quick disassembly and assembly of the exhaust gas detector (3); The gas collection box (1) has an ejection structure installed on its inner bottom wall, which is located directly below the opening of the rectangular through slot (2).

2. The vehicle exhaust gas collection and detection instrument for vehicle exhaust gas detection according to claim 1, characterized in that, The assembly and disassembly assembly includes a strip-shaped placement groove 2 (16) horizontally opened on the bottom wall of the gas collection box (1) and a limiting slot (21) opened on the periphery of the exhaust gas detector (3). A horizontal fixing rod (17) is fixedly connected between the two end walls of the strip-shaped placement groove 2 (16). A spring 3 (18) is sleeved on the periphery of the horizontal fixing rod (17). A movable sleeve block (19) is slidably sleeved on the periphery of the horizontal fixing rod (17). The movable sleeve block (19) is slidably connected to the inner wall of the strip-shaped placement groove 2 (16). A limiting plug (20) is fixedly connected to the lower end surface of the movable sleeve block (19). A linkage component is connected between the limiting plug (20) and the piston plate (14).

3. The vehicle exhaust gas collection and detection instrument for vehicle exhaust gas detection according to claim 1, characterized in that, The sealing mechanism includes a strip-shaped placement groove (6) vertically opened on the end surface of the gas collection box (1). A support rod (7) is fixedly connected between the two end walls of the strip-shaped placement groove (6). A spring (8) is sleeved around the support rod (7). A sliding sleeve block (9) is slidably sleeved around the support rod (7). The sliding sleeve block (9) is slidably connected to the inner wall of the strip-shaped placement groove (6). A sealing plate (10) is fixedly connected to the surface of the sliding sleeve block (9). The sealing plate (10) contacts and slides with the gas collection box (1).

4. The vehicle exhaust gas collection and detection instrument for vehicle exhaust gas detection according to claim 1, characterized in that, The ejection structure includes a telescopic rod (23) fixedly connected to the top wall of the gas collection box (1), a bearing plate (24) fixedly connected to the lower end of the telescopic rod (23), and a spring four (25) sleeved around the telescopic rod (23).

5. The vehicle exhaust gas collection and detection instrument for vehicle exhaust gas detection according to claim 2, characterized in that, The linkage component includes a sleeve block (26) fixedly connected to the top wall of the gas collection box (1), a connecting rod (27) fixedly connected to the surface of the piston plate (14), the sleeve block (26) is slidably sleeved on the periphery of the connecting rod (27), one end of the connecting rod (27) is fixedly connected to one end of the limiting plug (20), and one end of the limiting plug (20) is provided with an arc-shaped slope (22).

6. The vehicle exhaust gas collection and detection instrument for vehicle exhaust gas detection according to claim 1, characterized in that, The sealing structure includes a docking ring (11) fixedly connected to the periphery of the docking pipe (5) and a sealing slot (12) opened on the end surface of the gas collection box (1), and the sealing slot (12) is designed to be located at the periphery of the air inlet (4). The docking ring (11) is fixedly connected to a sealing insert ring (13) on the end surface of the gas collection box (1).

7. The vehicle exhaust gas collection and detection instrument for vehicle exhaust gas detection according to claim 3, characterized in that, One end of the spring (8) is fixedly connected to the end wall of the strip groove (6), and the other end of the spring (8) is fixedly connected to one end surface of the sliding sleeve (9).

8. The vehicle exhaust gas collection and detection instrument for vehicle exhaust gas detection according to claim 4, characterized in that, The upper end of the four springs (25) is fixedly connected to the inner top wall of the gas collection box (1), and the lower end of the four springs (25) is fixedly connected to the upper surface of the bearing plate (24).

9. The vehicle exhaust gas collection and detection instrument for vehicle exhaust gas detection according to claim 2, characterized in that, One end of the limiting plug (20) is inserted into the inner wall of the limiting slot (21), and the opening size of the limiting slot (21) is adapted to the design size of the limiting plug (20).

10. The vehicle exhaust gas collection and detection instrument for vehicle exhaust gas detection according to claim 6, characterized in that, The sealing ring (13) is inserted into the inner wall of the sealing slot (12), and the opening size of the sealing slot (12) is compatible with the design size of the sealing ring (13).

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